A printed antenna comprising a substrate, a first ground plane, a low frequency radiation, a high frequency radiation, a first matching portion, a second matching portion is provided. The first ground plane, the low frequency radiation portion, the high frequency radiation portion and the first matc
A printed antenna comprising a substrate, a first ground plane, a low frequency radiation, a high frequency radiation, a first matching portion, a second matching portion is provided. The first ground plane, the low frequency radiation portion, the high frequency radiation portion and the first matching portion are located on an upper surface of the substrate. The low frequency radiation portion is connected to the high frequency radiation portion, and the first matching portion is extended from the first ground plane and towards the high frequency radiation portion. The second matching portion is adjacent to the first matching portion but does not overlap the first matching portion.
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1. A printed antenna, comprising: a substrate, comprising: an upper surface; anda lower surface opposite to the upper surface;a first ground plane located on the upper surface and having a first ground lateral side;a low frequency radiation portion located on the upper surface, wherein the low frequ
1. A printed antenna, comprising: a substrate, comprising: an upper surface; anda lower surface opposite to the upper surface;a first ground plane located on the upper surface and having a first ground lateral side;a low frequency radiation portion located on the upper surface, wherein the low frequency radiation portion comprises: a first belt-like radiation portion;a second belt-like radiation portion, wherein one end of the second belt-like radiation portion is connected to one end of the first belt-like radiation portion to form a first bending; anda third belt-like radiation portion, wherein one end of the third belt-like radiation portion is connected to the other end of the second belt-like radiation portion to form a second bending, and the first belt-like radiation portion, the second belt-like radiation portion and the third belt-like radiation portion together form an opening;a high frequency radiation portion located on the upper surface and disposed inside the opening, wherein the high frequency radiation portion comprises: a first high frequency lateral side opposite to the first bending, wherein one end of the first high frequency lateral side is connected to the other end of the third belt-like radiation portion; anda second high frequency lateral side parallel to the first belt-like radiation portion, wherein one end of the second high frequency lateral side is connected to the other end of the first high frequency lateral side to form an acute angle; anda first matching portion located on the upper surface and on a vertical connection line connecting the vertex of an acute angle and the first ground lateral side, wherein the first matching portion is extended from the first ground lateral side and towards the first belt-like radiation portion; anda second matching portion adjacent to the first matching portion but not overlapping the first matching portion. 2. The printed antenna according to claim 1, further comprising a second ground plane, wherein the second ground plane comprises a second ground lateral side, the second ground plane and the second matching portion are formed on the lower surface, and the second matching portion is extended from the second ground lateral side and towards the first belt-like radiation portion. 3. The printed antenna according to claim 2, further comprising a third matching portion located on the upper surface, and the second matching portion is disposed between the first matching portion and the third matching portion. 4. The printed antenna according to claim 1, wherein the second matching portion is formed on the upper surface, and the second matching portion is extended from the first ground lateral side and towards the first belt-like radiation portion. 5. The printed antenna according to claim 1, wherein the size and shape of the second matching portion are identical to that of the first matching portion. 6. The printed antenna according to claim 1, wherein the distance between the first matching portion and the first high frequency lateral side is 1 mm. 7. The printed antenna according to claim 1, wherein the high frequency radiation portion further comprises a third high frequency lateral side perpendicularly connected to the second high frequency lateral side, and the distance between the third high frequency lateral side and the second belt-like radiation portion ranges between 1.5˜2 mm. 8. The printed antenna according to claim 7, wherein the high frequency radiation portion further comprises a fourth high frequency lateral side connecting the first high frequency lateral side and the third high frequency lateral side. 9. The printed antenna according to claim 1, wherein the high frequency radiation portion further comprises a third high frequency lateral side connecting the first high frequency lateral side and the second high frequency lateral side. 10. The printed antenna according to claim 1, wherein the high frequency radiation portion further comprises a third high frequency lateral side and a fourth high frequency lateral side, the third high frequency lateral side connects the second high frequency lateral side and the fourth high frequency lateral side, and the third high frequency lateral side and the fourth high frequency lateral side are opposite to the first bending and the second bending respectively. 11. The printed antenna according to claim 1, wherein the distance between the third belt-like radiation portion and the first ground lateral side is 1 mm. 12. The printed antenna according to claim 1, wherein the distance between the first high frequency lateral side and the first belt-like radiation portion ranges between 3.5˜4 mm. 13. The printed antenna according to claim 1, wherein the second matching portion and the first matching portion are symmetric to each other in a left-right manner.
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